Basic Authentication and Exchange Online – July Update

@The_Exchange_Team 
As already anounced, Microsoft ins planning to disable BASIC Auth for EWS, IMAP, POP3, EAS, PowerShell in H2 2021.

Out Tenants have been created in mid of 2017.

Therefore no BASIC Auths for any protocols have been disabled yet.

When the Disable starts in H2 2021, will it utilizing the "Security Defaults"-Switch or the "Authentication Polices"?

Or is it another, general setting which cannot manymore be manipulated by the Tenant Admin.

I'm asking because I want to know if it's possible to use "Authentication Policies" to re-enable using Basic Auth (for example for IMAP Protocol) in one Tenant, even after it's official disablement.